2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 9:45 AM - 10:00 AM | FISH USE OF LAKE MICHIGAN DROWNED RIVER MOUTHS: A CONCEPTUAL MODEL OF LIFE HISTORY TYPES | 430 B
FISH USE OF LAKE MICHIGAN DROWNED RIVER MOUTHS: A CONCEPTUAL MODEL OF LIFE HISTORY TYPES
Freshwater river mouths in large lakes are centers for biological activity, yet there has been relatively little ecological research on these ecosystems relative to upstream rivers and downstream large lakes. Drowned river mouths (DRMs) are protected, lake-like ecosystems that connect tributaries to large lakes and are a common feature along Lake Michigan’s eastern shoreline. DRMs have diverse fish assemblages and are more eutrophic than Lake Michigan with greater biomasses of phytoplankton, zooplankton, and benthic macroinvertebrates. Using a conceptual model of the three main habitats (lake, DRM, and river), I identify nine possible life history types: three resident (i.e., fish primarily use one habitat) and six migratory types. For each migratory type, fish can be classified as stragglers that “accidentally” use another habitat type, opportunists that enter another habitat at some point in their life cycle, or habitat-dependent that require another habitat for critical stages in their life cycle. Based on literature and field studies, I provide examples of fishes for each life history type. I hypothesize that most fishes in DRMs are residents; however, complex migratory behaviors emphasize many cases where fishes provide direct links among the three habitats.
- Movement
- Connectivity
- Great Lakes
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Presenters/Authors
Carl R. Ruetz III
(), Grand Valley State University, ruetzc@gvsu.edu;
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